Unipi 1.1 Lite. Technical Documentation

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Unipi 1.1 Lite

Technical Documentation

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Content

1 Product introduction 3

2 Product description 5

3 GPIO pins use 6

4 GPIO connector 6

5 Power supply 7

6 Mount Raspberry Pi to Unipi 1.1 Lite 7

7 Connecting and installation 8

8 Relay outputs 8

9 Digital inputs 8

9.1.1 Selecting power supply of digital inputs 8

10 EEPROM 9

11 1-Wire channel 9

12 Technical specification 10

13 Connected I2_{C integrated circuits} ₁₀

14 Relay outputs 10

15 Digital outputs 10

16 Power supply 10

17 Dimensions 10

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1 Product introduction

Unipi 1.1 Lite is an expansion module for Raspberry Pi, with which it forms a simple programmable control unit, which can be used for simple projects like smart home management, measuring and regulation and develop innovations in IoT world. Device is equipped with 6 digital inputs (7-24VDC), 6 relay outputs (250V AC/5A or 24V DC/5A) and integrated 1-Wire channel.

Digital inputs and relay outputs are equipped with signal LEDs. Power for digital inputs is supplied by 12V DC internal power supply limited to 100mA and featuring a short-circuit protection. It is also possible to use digital inputs with external power supply (see below).

The device also provides easy access to the GPIO, I2_{C, UART, 5V, 3V3 a GND pins via onboard side} connector labeled GPIO CON.

Unipi 1.1 Lite is compatible with many software products. It is recommended to use on of our supported platforms like Evok opensource API or advanced platform Mervis. Visit our web pages

www.Unipi.technology for more information.

Unipi 1.1 Lite is compatible with the following Raspberry Pi models: - Raspberry Pi model B+

- Raspberry Pi 2 model B

- Raspberry Pi 3 model B

- Raspberry Pi 3 model B+

- Raspberry Pi 4 model B (all RAM variants)

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4 Product description

● Relay outputs: 6 × changeover relay 250VAC@5A or 24VDC@5A – for use with controlled

devices (e.g. door locks, lights)

● Digital inputs: 6 × galvanically isolated (2 × 3) digital input (7-24V DC) for reading signals

from external devices (e.g. magnetic contacts, motion sensors)

● Wire channel: Integrated channel for Wire bus available via RJ45 port for connecting

1-Wire devices (e.g. digital thermometers)

● Power supply 5V DC: 2.1 mm for power supply connection

● RPi connector: 26-pin connector for Raspberry Pi connection

● +12V: Integrated power supply 12V@100mA – for use with digital inputs only

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5 GPIO pins use

Tab. 1 – Raspberry Pi P1 header map

Unipi RPi BCM Function DI01 GPIO04 Digital input

DI02 GPIO17 Digital input

DI12 GPIO10 Digital input Tab.2 – MCP23008 pin map

Relay MCP23008 6 GP2 5 GP3 4 GP4 3 GP5 2 GP6 1 GP7

6 GPIO connector

The unused GIPOs or RPi are wired out via the side connector labeled GPIO CON. You can see pins description on next picture and table.

GPIO Description 1 GND 2 GND 3 GND 4 GND 5 +5V 6 +3V3 7 TX 8 RX 9 SCL 10 SDA 11 GPIO10 12 GPIO18 13 GPIO11 14 GPIO09 15 GPIO07 16 GPI08

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7 Power supply

5VDC/2A is recommended as power supply for Unipi 1.1 Lite connected to 2.1 mm DC connector. Unipi 1.1 Lite can supply power for Raspberry Pi up to 2A, power supply is realized by flat connecting cable and not use microUSB connector on RPi.

Caution

Supplying power for Unipi 1.1 Lite from Raspberry Pi is not recommended, as it could cause damage to Raspberry Pi or Unipi 1.1 Lite.

8 Mount Raspberry Pi to Unipi 1.1 Lite

To mount Raspberry Pi to Unipi 1.1 Lite do the following:

1. Screw the spacers to the holes in the circuit board, dedicated for Raspberry Pi. 2. Use attached flat cable to interconnect RPi and Unipi 1.1 Lite.

3. Screw the Raspberry Pi to the spacers

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9 Connecting and installation

10 Relay outputs

Maximal load of relay outputs is 250 VAC/5A or 24V DC/5A. For switching more current it is necessary use external relay or contactor.

Relays are controlled by MCP23008 (I2C 0x20 address), more information about connection relays with MCP chip GPIO is in Table 2. Each relay has indication LED.

On each relay are three contacts labeled C (common), NO (normally opened) a NC (normally closed). In OFF state, C and NC are connected (NO is not connected), when switch relay to ON state C and NO will be connected (NO will be disconnected).

11 Digital inputs

Signal for digital inputs must be in range of 5 to 24V DC. Each input provides LED indicating the state of the input. Device is equipped 6 digital inputs which are divided into two galvanically isolated groups – A and B. Group A contains inputs 1-3, group B contains inputs 4-6.

Digital inputs description

11.1.1 Selecting power supply of digital inputs

Signal to digital inputs can be supplied using internal 12V power supply or using external 7-24V DC power supply. The onboard DIP switch is used to select between these two supplies.be done by internal power supply +12V or external power supply. Each group has one connector for connecting negative pole of the external power supply (Is not used when using the internal 12).

DIGND ON OFF INT EXT

The dip switch has two positions – each position allows selecting power supply mode for one of DI groups and is marked by corresponding label. By default, both positions are set to OFF state. By

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12 EEPROM

Unipi 1.1 Lite device has integrated EEPROM memory (24C02) for storage important information of size 2 kb organized to one block 256*8-bit.

Address space 0xe0 – 0xff is reserved. Other address space is left for user use. Tab. 4 – memory organization

Starting address Number of bytes Example Definition

0xe0 2 fa-55 Unipi identification

0xe2 2 1.1 Unipi version

13 1-Wire channel

Device has one integrated channel for 1-Wire bus(DS2482-100, address: 0x18). The bus is wired out via RJ45 connector. The description of pins is described in the following table. The data line has overvoltage protection and the power of the line is protected with TVS protection and current is limited to 50 mA.

Tab. 5 – RJ45 pins function

RJ45 pin Function 1 - 2 - 3 GND 4 5Vcc 5 5Vcc 7 DATA 8 GND

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14 Technical specification

15 Connected I

2

_{C integrated circuits}

All of connected I2_{C chips are connected to the main bus.}

Chip type Address Use

MCP23008 0x20 Relay outputs

DS2482-100 0x18 1-Wire master

24C02ASN 0x50-0x57 EEPROM

16 Relay outputs

● Version Unipi 1.1 Lite: 6 × SPDT Omron G5Q-14-EU: 250V AC/5A or 24V DC/5A

17 Digital outputs

● 6 × 7-24V DC, galvanically isolated into two groups of three DIs

18 Power supply

● Unipi 1.1 Lite power supply connector is standard with 2.1 inner and 5.5 mm outer diameter ● Power supply 5V with 2A

Power cord requirements

● Minimal 18. AWG, ross-section 0.75 mm2

Note

Unipi 1.1 device can supply RPi with up to 2A current.

19 Dimensions

● Width: 105 mm ● Height: 88 mm

● Depth: 20 mm (40mm with mounted RPi, cable and spacers) ● Weight: 0.21kg

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20 Conclusion

Latest edit: 31.08.2020